Refrigerating machine



Sept. 16 1924 l. LUNDGAARD REFRIGERAT'ING MACHINE Filed Nov. 21

HMI

Patented Sept. 16, 1324. .i

l l ,sosia IVAB. LUNDGAARD, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE AUTOMATIC REFRIGERATING COMPANY, OF HARTFORD, CONNECTICUT, A. CORPORATION OF NEW JERSEY.

REFRIGERATING MACHINE.

Application led November 21, 1923. Serial No. 676,053.

To all whom it may concern.'

Be it known that I, IvAR LUNDGAARD, a citizen of the United States, and a `resident of Hartford, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Refrigerating Machines, of which the following is a specification.

This invention relates to an air refrigerating machine of the closed cycle type. A machine of this class is shown in my previous Patent No. 1,240,862, dated September th, 1917. The present invention has forits object a different relation of the air coinpressing cylinder and the air expanding cylv mounted thereon that operate through rollers 4 and levers 5, connected rods 6 to pistons 7 and 8 of the compressing and expanding cylinders 9 and 10.A These cylinders are mounted on the crank case at a substantial distance apart and a 'com-munieating passage or .conduit 11 leads from the head of one cylinderto the head of the other. This passage has interposed `in it heat exchangers 12'and 13 separated by a. portion of the conduit 14 that is made of material which is a poor conductor of heat. The heat exchangers are surrounded with casings 15 so that cooling fluid vmay be brought to act upon the hot exchanger 412 while another fluid may be chilled by being brought into contact with the cold exchanger 13. These exchangers have vanes that give out and absorb heat from the air in its assage from one cylinder to the other. The e ges of these vanes are in contact with the walls of the exchangers and the walls have outside vanes for imparting and receiving heat from the surrounding fluids.

The expanding cylinder has its cylinder head 16 held on by a clamp .17 .and bolts 18, to Jhe base of the cylinder, the intermediate insulating section of the cylinder 19' being also. The upper end of the expansion piston 8 ismade of heat insulating material (as shown at 23), so as to keep the warmth of the piston 8 from being communicated. I

to the refrigerated air in the upper part of the cylinder. The cold .exchanger and the upper part of the expansion cylinder are enveloped in a heat insulating' ]acket 24 to prevent absorption of heat thereby.

The thermo-dynamic cycle upon which y this machine operates is similar to that of the patentl above referred to and need not be further explained herein.

1. An air refrigerating machine of the closed cycle type comprising `a crank ca se, a compression cylinder, an expansion cylinder, the said expansion cylinder having a heat insulating band between the head and the base of the cylinder, both cylinders open- -ing into the crank case and having closed outer ends, a conduit connecting the closed ends of the cylinders, heat exchangers in said conduit for discharging heat into a coolingiuid land abstracting heat from al fluid to be cooled, a heat insulating section between the exchangers, pistons in said cylinders, a driving shaft inthe crank case, interconnected mechanism between the shaft and pistons operating to transfer the air from one cylinder tothe other through the said exchangers and heat insulating cover for the expansion piston.

2. An vair refrigerating machine of the lclosed cycle type comprising a crank case,

a compression cylinder, an expansion cylinder, the said expansion cylinder having a heat insulating band between Ythe head andv the base of the cylinder, both cylinders opening into the crank case and having closed outer ends, a conduit connecting the closed l ends 4of the cylinders, heatv exchangers in l Moeten said conduit for discharging heat into a from one cylinoler to the other through the cooling Huid. and abstractingheat from a saiol exchangers, heat insulating cover tor fluid tobe cooled, a heat insulating section the expansion iston and a heat insulating l@ between the exchangers, pistons in said cyljacket surroun ing the expansion cylinder 5 inders, ay driving shaft in the crank case, and its adjacent exchanger.

interconnected mechanism between the shaft and pistons operating to transfer the air llVAllt LUNDGAARD. 

